Saia-Burgess motors, Germany Saia-Burgess models, Saia-Burgess prices

Saia-Burgess motors are AC motors that generate electromagnetic torque through the interaction between the rotating magnetic field in the air gap and the induced current in the rotor windings, thereby converting electrical energy into mechanical energy. Three-phase asynchronous motors are primarily used as motors to drive various production machinery, such as fans, pumps, compressors, machine tools, light industrial and mining machinery, threshers and crushers in agricultural production, and processing machinery for agricultural products, etc. They feature simple structure, ease of manufacturing, low cost, reliable operation, durability, high operating efficiency, and suitable working characteristics.

Saia-Burgess motor applications

Static terminology for motors: Number of phases: The number of pairs of excitation coils that produce magnetic fields with different pole pairs N, S. Commonly expressed in m. Beat count: The number of pulses or conductive states required to complete one periodic change of the magnetic field, expressed as n, or refers to the number of pulses required for the motor to rotate through one tooth pitch angle. Taking a four-phase motor as an example, the four-phase four-beat operation mode is AB-BC-CD-DA-AB, and the four-phase eight-beat operation mode is A-AB-B-BC-C-CD-D-DA-A. Step angle: The angular displacement of the motor rotor corresponding to one pulse signal, denoted by θ. θ = 360 degrees / (rotor teeth J * operating beats). Taking a conventional two-phase or four-phase motor with 50 rotor teeth as an example: In four-beat operation, the step angle is θ = 360 degrees / (50 * 4) = 1.8 degrees (commonly known as full step); in eight-beat operation, the step angle is θ = 360 degrees / (50 * 8) = 0.9 degrees (commonly known as half step). Detent torque: The locking torque of the motor rotor itself when the motor is not energized (caused by harmonics of the magnetic field tooth shape and mechanical errors). Static torque: The locking torque of the motor shaft when the motor does not rotate under rated static excitation. This torque is a standard for measuring motor volume (geometric dimensions) and is independent of drive voltage and drive power supply. Although static torque is proportional to the electromagnetic excitation ampere-turns and related to the air gap between the stator teeth and the rotor, it is inadvisable to excessively reduce the air gap or increase excitation ampere-turns to increase static torque, as this will cause motor heating and mechanical noise.

Saia-Burgess motor applications

Motors have advantages such as simple structure, ease of manufacturing, low cost, and reliable operation, but their power factor is relatively low (less than 0.5), and efficiency is also lower. The power of reluctance synchronous motors generally ranges from a fraction of a watt to hundreds of watts, and they are commonly used in automatic control devices, physical instruments, movie projectors, electrostatic copiers, and other equipment. Reluctance synchronous motors have a simple structure, low cost, and reliable operation, and are widely used in automatic and remote control devices, recording fax machines, and the clock industry. An AC motor whose ratio of operating speed to the connected power supply frequency is a constant value. When the motor is running, the speed is always equal to the synchronous speed, hence the term synchronous motor. Synchronous motors are widely used in high-power production machinery that does not require speed regulation, such as large air compressors, crushers, blowers, and motor-generator sets, with powers reaching several kilowatts or even tens of thousands of kilowatts. Compared with asynchronous motors of the same capacity, high-power synchronous motors have obvious advantages: high power factor, which can be operated at a leading power factor by adjusting the excitation current, helping to improve the power factor of the grid; smaller volume for high-power, low-speed synchronous motors. Synchronous motors can be divided into salient-pole and non-salient-pole types according to rotor structural characteristics, and are generally made as salient-pole types. If classified by the fixed position of the magnetic poles, there are rotating armature types with magnetic poles fixed on the stator (three-phase AC windings nested on the rotor, connected to the external circuit via slip rings and brushes on the shaft) and rotating field types with magnetic poles fixed on the rotor, with the latter being more common. The magnetic poles of synchronous motors are generally excited by DC current; those using permanent magnets are called permanent magnet synchronous motors. A synchronous motor operating in motor state without mechanical load, only providing or absorbing reactive power to the grid, is called a synchronous condenser or synchronous compensator, used to improve grid power factor and maintain grid voltage levels.

Saia-Burgess motor advantages

The motor's magnetic field is generated by permanent magnets, thereby avoiding excitation losses (i.e., copper losses) caused by generating the magnetic field through excitation current. With no current in the rotor, the motor temperature rise is significantly reduced; under the same load conditions, the temperature rise is more than 20K lower. Permanent magnet synchronous motors have a high power factor, which is independent of the number of motor poles. At full load, the power factor approaches 1, resulting in lower motor current compared to asynchronous motors, consequently reducing stator copper losses and achieving higher efficiency. In contrast, the power factor of asynchronous motors decreases as the number of poles increases. Furthermore, due to the high power factor of permanent magnet synchronous motors, the capacity of the associated power supply (transformer) can theoretically be reduced, allowing for lower specifications for associated switchgear and cables. Permanent magnet synchronous motors also offer advantages such as high starting torque, short starting time, and high overload capability. The installed capacity of the drive motor can be reduced based on the actual shaft power, saving energy and reducing fixed asset investment. Permanent magnet synchronous motors are easy to control, with constant speed that does not vary with load or voltage fluctuations but depends only on frequency, ensuring smooth and reliable operation. Due to strict speed synchronization and good dynamic response, they are suitable for variable frequency control. The installation dimensions of permanent magnet synchronous motors comply with IEC standards, allowing direct replacement of three-phase asynchronous motors. The protection rating can achieve IP54 and IP55, and some manufacturers also produce explosion-proof permanent magnet synchronous motors.

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